/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.info;

import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;

/**
 * This InstructionVisitor marks whether the methods whose instructions it visits contain the invokedynamic instruction.
 *
 * @author Eric Lafortune
 */
public class DynamicInvocationMarker extends SimplifiedVisitor
    implements InstructionVisitor, ConstantVisitor, ClassVisitor, MemberVisitor {
    // Implementations for InstructionVisitor.

    public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset,
        Instruction instruction) {}

    public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset,
        ConstantInstruction constantInstruction) {
        if (constantInstruction.opcode == InstructionConstants.OP_INVOKEDYNAMIC) {
            setInvokesDynamically(method);
        }
    }

    // Small utility methods.

    private static void setInvokesDynamically(Method method) {
        ProgramMethodOptimizationInfo.getProgramMethodOptimizationInfo(method).setInvokesDynamically();
    }

    /**
     * Returns whether the given method calls the invokedynamic instruction.
     */
    public static boolean invokesDynamically(Method method) {
        return MethodOptimizationInfo.getMethodOptimizationInfo(method).invokesDynamically();
    }
}
